package com.atguigu.gulimall.auth.controller;

import cn.hutool.core.util.RandomUtil;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.exception.BizCodeEnume;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.auth.feign.MemberFeignService;
import com.atguigu.gulimall.auth.feign.ThirdPartFeignService;
import com.atguigu.gulimall.auth.vo.UserLoginVo;
import com.atguigu.gulimall.auth.vo.UserRegistVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * @Author : Jungle
 * @Description : 编写路径映射
 * GulimallWebConfig 替代自定义路径映射
 */
@Controller
public class LoginController {
    @Autowired
    private StringRedisTemplate redisTemplate;
    @Autowired
    private ThirdPartFeignService thirdPartFeignService;
    @Autowired
    private MemberFeignService memberFeignService;

    /**
     * 发送一个请求直接跳转到一个页面
     * springMVC viewcontroller: 将请求和页面映射过来
     */
    //@GetMapping("/login.html")
    //public String loginPage(){
    //    return "login";
    //}
    //@GetMapping("/reg.html")
    //public String regPage(){
    //    return "reg";
    //}


    /**
     * 发送验证吗
     *
     * @return 这里需要和用前端调用交互@ResponseBody,或者放到类的上面
     */
    @ResponseBody
    @GetMapping("/sms/sendcode")
    public R sendCode(@RequestParam("phone") String phone) {
        // TODO: 2022/2/19 接口防刷
        String redisCode = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone);
        //取时间
        if (!StringUtils.isEmpty(redisCode)) {
            long l = Long.parseLong(redisCode.split("_")[1]);
            if (System.currentTimeMillis() - l < 60000) {
                //60秒内不能再发
                return R.error(BizCodeEnume.SMS_CODE_EXCEPTION.getCode(), BizCodeEnume.SMS_CODE_EXCEPTION.getMsg());
            }
        }

        /**
         * 1、接口防刷
         * 2、验证吗的再次验证 ，存入redis  存key-phone,value-code  sms:code:18949555420-->4566555
         */
        String code = RandomUtil.randomNumbers(6) + "_" + System.currentTimeMillis();

        //缓存验证码,并设置过期时间这里设置5分钟有效,防止同一个phone在60秒内再次发送验证码
        redisTemplate.opsForValue().set(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone, code, 5, TimeUnit.MINUTES);

        thirdPartFeignService.sendCode(phone, code.split("_")[0]);
        return R.ok();
    }

    /**
     * @param vo
     * @param result
     * @param redirectAttributes 重定向携带数据
     *                           //todo:重定向携带数据利用session原理 ，将数据放到session中，
     *                           只要调到下一个页面取出数据后，session中的数据就会被删掉
     *                           //todo 1、分布式下的session问题
     */
    @PostMapping("/regist")
    //开启校验
    public String regist(@Valid UserRegistVo vo, BindingResult result, RedirectAttributes redirectAttributes) {
        if (result.hasErrors()) {
            //key->Field   value->DefaultMessage
            Map<String, String> errors = result.getFieldErrors().stream().collect(Collectors.toMap(FieldError::getField, FieldError::getDefaultMessage));
            //model.addAttribute("errors", errors);
            redirectAttributes.addFlashAttribute("errors", errors);
            // Request method 'POST' not)supported
            // 用户注册-》regist【post】->转发到 reg.html（路径映射默认都是get方式访问）
            //校验出错，返回到注册页面
            //return "forward:/reg.html";

            //避免重复提交订单，选用重定向
            return "redirect:http://auth.gulimall.com/reg.html";
        }
        //真正的注册，调用远程的注册服务进行注册
        //1、校验验证码
        String code = vo.getCode();
        //得到redis中的value值（code_time）
        String s = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());

        if (!StringUtils.isEmpty(s)) {
            if (s.split("_")[0].equals(code)) {
                //删除验证码 ；令牌机制
                redisTemplate.delete(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
                //验证码通过  //真正注册，调用远程服务进行注册
                R r = memberFeignService.regist(vo);
                if (r.getCode() == 0) {
                    //成功
                    return "redirect:http://auth.gulimall.com/login.html";
                } else {
                    //失败，抛异常
                    Map<String, String> errors = new HashMap<>(4);
                    errors.put("msg", r.getData("msg", new TypeReference<String>() {
                    }));
                    redirectAttributes.addFlashAttribute("errors", errors);
                    return "redirect:http://auth.gulimall.com/reg.html";
                }

            } else {
                VerifyFail(redirectAttributes);
                //检验出错，跳转到；注册页面
                return "redirect:http://auth.gulimall.com/reg.html";
            }
        } else {
            VerifyFail(redirectAttributes);
            //检验出错，跳转到；注册页面
            return "redirect:http://auth.gulimall.com/reg.html";
        }
    }

    @GetMapping("/login.html")
    public String loginPage(HttpSession session) {
        Object attribute = session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (attribute == null) {
            //没登录，返回登录界面
            return "login";
        } else {
            return "redirect:http://gulimall.com";
        }
    }


    /**
     * @param vo 这里页面提交的是表单，不是json，不用加RequestBody
     * @return
     */
    @PostMapping("/login")
    public String login(UserLoginVo vo, RedirectAttributes redirectAttributes, HttpSession session) {
        //远程登录
        R login = memberFeignService.login(vo);
        if (login.getCode() == 0) {
            //成功
            MemberRespVo data = login.getData(new TypeReference<MemberRespVo>() {
            });
            //成功存入session
            session.setAttribute(AuthServerConstant.LOGIN_USER, data);
            return "redirect:http://gulimall.com";
        } else {
            Map<String, String> errors = new HashMap<>(4);
            errors.put("msg", login.getData("msg", new TypeReference<String>() {
            }));
            redirectAttributes.addFlashAttribute("errors", errors);
            return "redirect:http://auth.gulimall.com/login.html";
        }

    }


    /**
     * 验证失败
     *
     * @param redirectAttributes
     */
    private void VerifyFail(RedirectAttributes redirectAttributes) {
        Map<String, String> errors = new HashMap<>(4);
        errors.put("code", "验证码错误");
        redirectAttributes.addFlashAttribute("errors", errors);
    }
}
